Enhance your home theater audio with this Vizio S3821w-C0 wireless subwoofer. This active bass speaker unit is designed to bring deep, room-filling low frequencies to your audio setup. It is a dedicated unit for the 38-inch Vizio 2.1-channel sound bar system, ensuring seamless wireless connectivity and rich, immersive sound for your favorite movies, music, and games. This wireless subwoofer is in used condition, showing standard signs of previous ownership, but has been tested to ensure it powers on and functions properly. The sleek black finish allows it to blend in easily with your existing home entertainment setup while providing the deep bass performance Vizio systems are known for. Please note that this listing is for the wireless subwoofer only. It does not include the sound bar, remote control, or other accessories. It is an excellent solution if you need to replace a lost or broken subwoofer for your Vizio 38-inch 2.1 home theater audio system.